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-- CXA4002.A

--

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--*

--

-- OBJECTIVE:

--      Check that the subprograms defined in package Ada.Strings.Fixed are

--      available, and that they produce correct results.  Specifically,

--      check the subprograms Index, "*" (string constructor function),

--      Count, Trim, and Replace_Slice.

--

-- TEST DESCRIPTION:

--      This test demonstrates how certain Fixed string functions are used

--      to eliminate specific substrings from portions of text.  A procedure

--      is defined that will take as parameters a source string along with

--      a substring that is to be completely removed from the source string.

--      The source string is parsed using the Index function, and any substring

--      slices are replaced in the source string by a series of X's (based on

--      the length of the substring.)

--      Three lines of text are provided to this procedure, and the resulting

--      substitutions are compared with expected results to validate the

--      string processing.

--      A global accumulator is updated with the number of occurrences of the

--      substring in the source string.

--

--

-- CHANGE HISTORY:

--      06 Dec 94   SAIC    ACVC 2.0

--

--!

with Ada.Strings;

with Ada.Strings.Fixed;

with Ada.Strings.Maps;

with Report;

procedure CXA4002 is

begin

   Report.Test ("CXA4002", "Check that the subprograms defined in package "  &

                           "Ada.Strings.Fixed are available, and that "      &

                           "they produce correct results");

   Test_Block:

   declare

      TC_Total : Natural := 0;

      Number_Of_Lines : constant := 3;

      type Restricted_Words_Array_Type is array (1..10) of String (1..10);

      Restricted_Words : Restricted_Words_Array_Type :=

                           ("   platoon", " marines  ", "  Marines ",

                            "north     ", "south     ", "      east",

                            "  beach   ", "   airport", "airfield  ",

                            "     road ");

      subtype Line_Of_Text_Type is String(1..25);

      type    Page_Of_Text_Type is array (1..Number_Of_Lines)

        of Line_Of_Text_Type;

      Text_Page : Page_Of_Text_Type := ("The platoon of Marines   ",

                                        "moved south on the south ",

                                        "road to the airfield.    ");

      TC_Revised_Line_1 : constant String := "The XXXXXXX of XXXXXXX   ";

      TC_Revised_Line_2 : constant String := "moved XXXXX on the XXXXX ";

      TC_Revised_Line_3 : constant String := "XXXX to the XXXXXXXX.    ";

      ---

      procedure Censor (Source_String  : in out String;

                        Pattern_String : in     String) is

         -- Create a replacement string that is the same length as the

         -- pattern string being removed.

         Replacement : constant String :=                              -- "*"

                         Ada.Strings.Fixed."*"(Pattern_String'Length, 'X');

         Going       : Ada.Strings.Direction := Ada.Strings.Forward;

         Map         : constant Ada.Strings.Maps.Character_Mapping :=

                         Ada.Strings.Maps.Identity;

         Start_Pos,

         Index       : Natural := Source_String'First;

      begin  -- Censor

         -- Accumulate count of total replacement operations.

         TC_Total := TC_Total +                                     -- Count

                       Ada.Strings.Fixed.Count (Source  => Source_String,

                                                Pattern => Pattern_String,

                                                Mapping => Map);

         loop

            Index := Ada.Strings.Fixed.Index                        -- Index

                       (Source_String(Start_Pos..Source_String'Last),

                        Pattern_String,

                        Going,

                        Map);

            exit when Index = 0;   -- No matches, exit loop.

            -- if a match was found, modify the substring.

            Ada.Strings.Fixed.Replace_Slice                   -- Replace_Slice

                                (Source_String,

                                 Index,

                                 Index + Pattern_String'Length - 1,

                                 Replacement);

            Start_Pos := Index + Pattern_String'Length;

         end loop;

      end Censor;

   begin

      -- Invoke Censor subprogram to cleanse text.

      -- Loop through each line of text, and check for the presence of each

      -- restricted word.

      -- Use the Trim function to eliminate leading or trailing blanks from

      -- the restricted word parameters.

      for Line in 1..Number_Of_Lines loop

         for Word in Restricted_Words'Range loop

             Censor (Text_Page(Line),

                     Ada.Strings.Fixed.Trim(Restricted_Words(Word),   -- Trim

                                            Ada.Strings.Both));

         end loop;

      end loop;

      -- Validate results.

      if TC_Total /= 6 then

         Report.Failed ("Incorrect number of substitutions performed");

      end if;

      if Text_Page(1) /= TC_Revised_Line_1 then

         Report.Failed ("Incorrect substitutions on Line 1");

      end if;

      if Text_Page(2) /= TC_Revised_Line_2 then

         Report.Failed ("Incorrect substitutions on Line 2");

      end if;

      if Text_Page(3) /= TC_Revised_Line_3 then

         Report.Failed ("Incorrect substitutions on Line 3");

      end if;

   exception

      when others => Report.Failed ("Exception raised in Test_Block");

   end Test_Block;

   Report.Result;

end CXA4002;